【正文】 ype, Boolean, and the string of text, and other data types, but the biggest advantage is through dialog forms of interactive operations generate standard C code. In addition LabWindows / CVI provides a very rich debug tools, including singlestep, breakpoints, variable view, monitor window, and so on, these features make the adjustment process has bee more vulnerable. Have the function ★ function with realtime display: Acquisition Acquisition signal to the input signal and realtime display in a PC terminal. ★ digital filtering: IIR filter on the use of digital signal processing and realtime filtering, at the same time filter can be set up in the best approximation function type, filter type, order, from top to bottom cutoff frequency, and other parameters. ★ latest wave show: to meet the transient waveform display, but can also be transient waveform to be saved. ★ waveform storage: at any time after the original signal or signals to the LVM LabVIEW unique file format stored on the local hard drive, for future analysis or processing. One transient signal to the cutoff wave after BMP format images stored in local hard 上供 view and analysis of the future. ★ significant wave back: to keep the memory of the LVM format waveform reread the document and then displayed on a PC client. ★ spectrum analysis: After the filter frequency signal respectively corresponding analysis and response analysis of the frequency and wave at the same time to show realtime manner and form. Basic principles the use of hardware acquisition card acquisition signals, using software provided by NI DAQmx READ acquisition signals, and then through Waveform Graphs to conduct realtime display. This has a basic oscilloscope, signal showed that after using Write To Measurement File waveform will be saved as LVM documents. This realization of the basic store function, but through Read To Measurement File can be read LVM, thus pleting the echo feature. As the hardware and the acquisition of PCcardbased, so the limit of sampling oscilloscopes in the rate, bandwidth, resolution, and other parameters is limited. And procedures on the response time is dependent on the PC39。Enable from the shortcut menu to insert the Enable input. In the previous exercise you learned to add inputs and outputs by expanding the Express VI using the down arrows. Notice that this method is a different way of displaying and selecting the inputs and outputs of an Express VI. The inputs and outputs of an Express VI appear in a predetermined order when you add new inputs and outputs. To select a specific input, you may need to add an input first, then change the input to the specific one you want to use. 6. Move the Write to File terminal to the left of the Write LabVIEW Measurement File Express VI. 7. Wire the Write to File terminal to the Enable input of the Write LabVIEW Measurement File Express VI. The block diagram should appear similar to Figure 26. Figure 26. Block Diagram for the Save Data VI 8. Display the front panel and run the VI. Click the Write to File button several times. 9. Click the STOP button on the front panel. 10. To view the data you saved, open the Selected file with a spreadsheet or word processing application. Notice how the Selected file differs from the file. recorded all the data generated by the Save Data VI, whereas Selected only recorded the data when you pressed the Write to File button. 11. Save and close this VI. Or to talk about the need to improve the design of the place. The first is efficiency. Whether this design is from the original intention of the design or the result of design, are not fully take into account the efficiency of procedures and the efficiency of operation. Only a small number of functions and the realization of the need to optimize. This design were pleted in less than one day of production, coupled with debugging time. Efficiency is not high enough reflected in the following areas. First, pipeline design process is running, the first concrete manifestation of the panel after the switch a few interface background did not stop running, but has been in operation, this will waste a lot CPU resources, only a simple function of the increase did not conduct an effective integration. Second, file storage efficiency is not high. LabVIEW provides a wide range of data storage file format, which is the most efficient binary form, followed by the text. The use of this design is unique to the LVM LabVIEW format, the benefits of doing so is called for, deficiency is not mon, other software will not be able to read this document effective waveform information. With the Windows Notepad to open LVM documents found, in fact, LVM is a document essentially a text file, recording a wave of data related information, but the utilization rate is not high enough. Thirdly, it is part of the process of debugging tests left some function in the design of not deleted, only the former was hidden template processing, in fact CPU is still running in this part of the function of consumption of resources. Fourth is here to the six Waveform Graphs, just in front panel made a stack processing, it is a screen In fact, for certain procedures can significantly reduce the optimized use of Waveform Graphs. At the same time because in theory if not need to show that the public can be a screen”. This was followed by the humanputer interface design. Ease of operation needs to be raised. In addition to the necessary selfbutton interface, the button should better. For example, switch interface automatically trigger procedures, and omit one of the switch button. In addition to the design of the interface graphics, there are too many forms, the ideal situation is designed to be hidden in control of the state model. Once again there is a regret. C